On Fri, Nov 6, 2015 at 2:03 PM, Kevin Grittner <kgri...@ymail.com> wrote:
> Has anyone taken a close look at what happens if the two sides of
> the merge join have different implementations of the same collation
> name?  Is there anything we should do to defend against the
> problem?

The issue of FDWs vs. collations has been thought about to some degree
(see FDW_COLLATE_NONE/SAFE/UNSAFE), but I don't quite understand that
stuff in detail.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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